diff --git a/src/include/janet.h b/src/include/janet.h
index 7d6f2fd1..b83d2f2c 100644
--- a/src/include/janet.h
+++ b/src/include/janet.h
@@ -236,7 +236,7 @@ extern "C" {
 /* Maximum depth to follow table prototypes before giving up and returning nil. */
 #define JANET_MAX_PROTO_DEPTH 200
 
-/* Maximum depth to follow table prototypes before giving up and returning nil. */
+/* Prevent macros to expand too deeply and error out. */
 #define JANET_MAX_MACRO_EXPAND 200
 
 /* Define default max stack size for stacks before raising a stack overflow error.